I noticed some gardeners around here sprinkle a layer of lime on top of their soil before they till. Our soil is mostly acidic and every one knows it. I recently bought some Dolomite lime to mix with some shredded pine bark, I was using a new recipe for potting soil. I know it is best to have the soil tested but I think it is good to mix a little with the soil outside too. Also Epsom salt is good, our soil is low in magnesium. Epsom salt will not change the pH but is really good in the garden. I read that compost will correct pH so that seems like an easy way out. lol.